Normally, Arduino App Lab is automatically updated when a new version is released. If you need to manually update App Lab, you can download and install the latest version from the Arduino website.

Follow these steps:

1. Open the Arduino Software page.
2. Find the Arduino App Lab section—not Arduino IDE or Arduino Lab for MicroPython.
3. Confirm that the download option for your operating system is selected and click Download.
4. Wait for the download to finish.
5. Install the application:
   • Windows: Run the .exe file from your Downloads folder and follow the prompts provided by the installer.
   • macOS: Open the .dmg file from your Downloads folder. Drag and drop Arduino App Lab into your Applications folder.
   • Linux: Extract the downloaded .tar.gz archive. Optionally, move the folder to your Application folder, or wherever you had previously installed App Lab.
6. If prompted, allow the installation to overwrite the old version of the application.
7. Launch Arduino App Lab to confirm the update was successful. You can see the version number by the title bar of the Arduino App Lab window. For example, if you are running version 0.3.0, the window title will be Arduino App Lab - 0.3.0.

To learn more about how to install and set up Arduino App Lab, see Getting Started with Arduino App Lab.

For more information about the software components, see Code repositories for Arduino App Lab components.